In a frequency sharing method, IS-95 base station apparatuses and W-CDMA base station apparatuses are arranged in a one-to-one correspondence. The first base station transmission power value of the first base station apparatus is obtained in each frequency band in the IS-95 scheme. The second base station transmission power value of the second base station apparatus adjacent to the first base station apparatus is obtained. Whether there is a frequency band in the IS-95 scheme in which the sum of the first and second base station transmission power values is a predetermined threshold or more is determined. When there is a frequency band in the IS-95 scheme in which the sum is the predetermined threshold or more, a frequency handoff is performed to switch a communication channel in the IS-95 scheme which is using the frequency band in which the sum is not less than the predetermined threshold to another frequency band in the IS-95 scheme. An IS-95 base station apparatus, a mobile communication system, and a W-CDMA base station apparatus are also disclosed.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A frequency sharing method in an IS-95/W-CDMA scheme in which a plurality of IS-95 base station apparatuses including first base station apparatuses and W-CDMA base station apparatuses including second base station apparatuses are arranged in a same service area, and an IS-95 scheme and a W-CDMA scheme share same frequency bands, comprising the steps of: arranging said plurality of IS-95 base station apparatuses and said plurality of W-CDMA base station apparatuses in a one-to-one correspondence; obtaining a first base station transmission power value of one of said first base station apparatuses in each frequency band in the IS-95 scheme; obtaining second base station transmission power values of ones of said second base station apparatuses adjacent to said one first base station apparatus; determining whether there is a frequency band in the IS-95 scheme in which a sum of the first and second base station transmission power values is not less than a predetermined threshold; and when there is a frequency band in the IS-95 scheme in which the sum is not less than the predetermined threshold, performing frequency handoff to switch a communication channel in the IS-95 scheme which is using the frequency band in which the sum is not less than the predetermined threshold to another frequency band in the IS-95 scheme.
2. A method according to claim 1 , wherein the step of obtaining the first and second base station transmission power values comprises the step of obtaining a first base station transmission power value by adding, in units of frequency bands, a base station FACH (Forward Access CHannel) transmission power value as a power value set for transmission via a FACH representing a one-way channel used to transmit control information/user packet data from a base station to a mobile station, a base station SDCCH (Stand alone Dedicated Control CHannel) transmission power value as a power value set for transmission via an SDCCH representing a two-way channel used to transmit control information between the base station and the mobile station, and a base station TCH (Traffic CHannel) transmission power value as a power value set for transmission via a TCH representing a two-way channel used to transmit user information between the base station and the mobile station.
3. A frequency sharing method in an IS-95/W-CDMA scheme in which a plurality of IS-95 base station apparatuses including first base station apparatuses and W-CDMA base station apparatuses including second base station apparatuses are arranged in a same service area, and an IS-95 scheme and a W-CDMA scheme share same frequency bands, comprising the steps of: arranging said plurality of IS-95 base station apparatuses and said plurality of W-CDMA base station apparatuses in a one-to-one correspondence; obtaining a first base station transmission power value of one of said first base station apparatus in each frequency band in the IS-95 scheme; obtaining second base station transmission power values of ones of said second base station apparatuses adjacent to said one first base station apparatus; determining whether there is a frequency band in the IS-95 scheme in which a sum of the first and second base station transmission power values is not less than a predetermined threshold; and band-limiting a portion of a frequency band used by the W-CDMA scheme in which the sum of the base station transmission power values is not less than the predetermined threshold.
4. A method according to claim 3 , wherein the step of obtaining the first base station transmission power value comprises the step of obtaining a first base station transmission power value by adding, in units of frequency bands, a base station FACH (Forward Access CHannel) transmission power value as a power value set for transmission via a FACH representing a one-way channel used to transmit control information/user packet data from a base station to a mobile station, a base station SDCCH (Stand alone Dedicated Control CHannel) transmission power value as a power value set for transmission via an SDCCH representing a two-way channel used to transmit control information between the base station and the mobile station, and a base station TCH (Traffic CHannel) transmission power value as a power value set for transmission via a TCH representing a two-way channel used to transmit user information between the base station and the mobile station.
5. An IS-95 base station apparatus comprising: first calculation means for calculating a base station FACH (Forward Access CHannel) transmission power value as a power value set for transmission via a FACH representing a one-way channel used to transmit control information/user packet data from a base station to a mobile station; second calculation means for calculating a base station SDCCH (Stand alone Dedicated Control CHannel) transmission power value as a power value set for transmission via an SDCCH representing a two-way channel used to transmit control information between the base station and the mobile station; third calculation means for calculating a base station TCH (Traffic CHannel) transmission power value as a power value set for transmission via a TCH representing a two-way channel used to transmit user information between the base station and the mobile station; adding means for adding the transmission power values output from said first to third calculation means in units of frequency bands in an IS-95 scheme to calculate a base station transmission power value; and occupied band control means for, when there is a frequency band in the IS-95 scheme in which a sum of a base station transmission power value of an adjacent W-CDMA base station apparatus which is notified from said adjacent W-CDMA base station apparatus and the base station transmission power value output from said adding means in units of frequency bands in the IS-95 scheme is not less than a predetermined threshold, performing a frequency handoff to switch a communication channel using the frequency band in which the sum is not less than the threshold to another frequency band.
6. An apparatus according to claim 5 , wherein said first calculation means calculates a base station FACH transmission power value based on a perch CH (CHannel) transmission power value indicating a power value for transmission via a perch CH used to notify systematic control information about each cell/sector from a base station to a mobile station, a mobile station perch CH reception SIR value indicating an SIR when the mobile station receives a signal transmitted from the base station via a perch CH, a mobile station FACH specified reception SIR value indicating an SIR value to be obtained when the mobile station is to receive a signal via a FACH, and a FACH rate correction value for correcting influences of different transmission rates in the CHs, said second calculation means calculates a base station SDCCH transmission power value based on a perch CH transmission power value, a mobile station perch CH reception SIR value, a mobile station SDCCH specified reception SIR value indicating an SIR value to be obtained when the mobile station is to receive a signal via an SDCCH, and an SDCCH rate correction value for correcting influences of different transmission rates in the CHs, and said third calculation means calculates a base station TCH transmission power value based on a perch CH transmission power value, a mobile station perch CH reception SIR value, a mobile station TCH specified reception SIR value indicating an SIR value to be obtained when the mobile station is to receive a signal via a TCH, and a TCH rate correction value for correcting influences of different transmission rates in the CHs.
7. A mobile communication system comprising: at least one mobile station; a plurality of IS-95 base station apparatuses for performing radio communications with said mobile stations by using an IS-95 scheme; a plurality of W-CDMA base station apparatuses which share same frequency bands set in a same service area with said IS-95 base station apparatuses, and perform radio communications with said mobile stations by using a W-CDMA scheme; and a host unit to which said IS-95 base station apparatuses are connected, each of said IS-95 base station apparatuses including: first calculation means for calculating a base station FACH transmission power value as a power value for transmission via a FACH representing a one-way channel used to transmit control information/user packet data from said IS-95 base station apparatus to said at least one mobile station; second calculation means for calculating a base station SDCCH (Stand alone Dedicated Control CHannel) transmission power value as a power value set for transmission via an SDCCH representing a two-way channel used to transmit control information between said IS-95 base station apparatus and said at least one mobile station; third calculation means for calculating a base station TCH (Traffic CHannel) transmission power value as a power value set for transmission via a TCH representing a two-way channel used to transmit user information between said IS-95 base station apparatus and said at least one mobile station; adding means for adding the transmission power values output from said first to third calculation means in units of frequency bands in the IS-95 scheme to calculate a base station transmission power value; and occupied band control means for, when there is a frequency band in the IS-95 scheme in which a sum of a base station transmission power value of an adjacent W-CDMA base station apparatus which is notified from each of said adjacent W-CDMA base station apparatuses and the base station transmission power value output from said adding means in units of frequency bands in the IS-95 scheme is not less than a predetermined threshold, performing a frequency handoff to switch a communication channel using the frequency band in which the sum is not less than the threshold to another frequency band.
8. A W-CDMA base station apparatus comprising: first calculation means for calculating a base station FACH transmission power value as a power value for transmission via a FACH representing a one-way channel used to transmit control information/user packet data from said W-CDMA base station apparatus to a mobile station; second calculation means for calculating a base station SDCCH (Stand alone Dedicated Control CHannel) transmission power value as a power value set for transmission via an SDCCH representing a two-way channel used to transmit control information between said W-CDMA base station apparatus and said mobile station; third calculation means for calculating a base station TCH (Traffic CHannel) transmission power value as a power value set for transmission via a TCH representing a two-way channel used to transmit user information between said W-CDMA base station apparatus and said mobile station; adding means for adding the transmission power values output from said first to third calculation means in units of frequency bands in an IS-95 scheme to calculate a base station transmission power value; and occupied band control means for, when there is a frequency band in the IS-95 scheme in which a sum of a base station transmission power value of an adjacent IS-95 base station apparatus which is notified from said adjacent IS-95 base station apparatus and the base station transmission power value output from said adding means is not less than a predetermined threshold, band-limiting a frequency band portion, of frequency bands used by the W-CDMA scheme, in which the sum of the base station transmission power values is not less than the threshold.
9. An apparatus according to claim 8 , wherein said first calculation means calculates a base station FACH transmission power value based on a perch CH (CHannel) transmission power value indicating a power value for transmission via a perch CH used to notify systematic control information about each cell/sector from a base station to a mobile station, a mobile station perch CH reception SIR value indicating an SIR when the mobile station receives a signal transmitted from the base station via a perch CH, a mobile station FACH specified reception SIR value indicating an SIR value to be obtained when the mobile station is to receive a signal via a FACH, and a FACH rate correction value for correcting influences of different transmission rates in the CHs, said second calculation means calculates a base station SDCCH transmission power value based on a perch CH transmission power value, a mobile station perch CH reception SIR value, a mobile station SDCCH specified reception SIR value indicating an SIR value to be obtained when the mobile station is to receive a signal via an SDCCH, and an SDCCH rate correction value for correcting influences of different transmission rates in the CHs, and said third calculation means calculates a base station TCH transmission power value based on a perch CH transmission power value, a mobile station perch CH reception SIR value, a mobile station TCH specified reception SIR value indicating an SIR value to be obtained when the mobile station is to receive a signal via a TCH, and a TCH rate correction value for correcting influences of different transmission rates in the CHs.
10. A mobile communication system comprising: at least one mobile station; a plurality of IS-95 base station apparatuses for performing radio communications with said mobile stations by using an IS-95 scheme; a plurality of W-CDMA base station apparatuses which share same frequency bands set in a same service area with said IS-95 base station apparatuses, and perform radio communications with said mobile stations by using a W-CDMA scheme; and a host unit to which said W-CDMA base station apparatuses are connected, each of said W-CDMA base station apparatuses including: first calculation means for calculating a base station FACH transmission power value as a power value for transmission via a FACH representing a one-way channel used to transmit control information/user packet data from said base station to said mobile station; second calculation means for calculating a base station SDCCH (Stand alone Dedicated Control CHannel) transmission power value as a power value set for transmission via an SDCCH representing a two-way channel used to transmit control information between said base station and said mobile station; third calculation means for calculating a base station TCH (Traffic CHannel) transmission power value as a power value set for transmission via a TCH representing a two-way channel used to transmit user information between said base station and said mobile station; adding means for adding the transmission power values output from said first to third calculation means in units of frequency bands in the IS-95 scheme to calculate a base station transmission power value; and occupied band control means for, when there is a frequency band in the IS-95 scheme in which a sum of a base station transmission power value of an adjacent W-CDMA base station apparatus which is notified from each of said adjacent WCDMA base station apparatuses and the base station transmission power value output from said adding means in units of frequency bands in the IS-95 scheme is not less than a predetermined threshold, performing a frequency handoff to switch a communication channel using the frequency band in which the sum is not less than the threshold to another frequency band.
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March 19, 1999
December 10, 2002
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